Quote:
Originally Posted by aussie_modder
With the leaner mixture, and fitment of a higher energy ignition system, a more advanced timing profile (more vacuum advance?) will also be possible?(lean mix takes longer to burn, but needs more spark to ignite).
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I think lean mix needs more spark, but I am not sure if it takes longer to burn. One thing for sure is it's more prone to pre ignition so more vacuum advance will probably hurt you.
The best thing you can do is get a wai and drive it like that for a couple of weeks, than put a cai and drive it like that, then you'll know for sure which one will get you better gas mileage. I think the trick here is going to be keeping air that's going to the carb the same temp and then adjust a/f mixture just for that.